【作者】 方克华；

【导师】 杨艳玲；

【作者基本信息】 北京工业大学 ， 市政工程， 2008， 硕士

【摘要】 醋酸乙烯-乙烯共聚乳液(VAE),是一种重要化工产品,在生产过程中会产生大量VAE乳液废水,具有COD含量高、浊度高以及呈稳定的乳液状的特点,可生化性差,属较难处理的工业废水,直接排放将给水体带来严重的污染。本课题采用混凝-沉淀和混凝-气浮方法,对VAE乳液废水的处理效果进行了研究;对无机混凝剂与有机高分子混凝剂复合投加处理VAE乳液废水的效果和影响因素进行了考察。混凝-沉淀和混凝-气浮试验结果表明,两种工艺对VAE乳液废水均有明显的去除效果,混凝-气浮方法的处理效果更佳。在最佳的处理条件下,混凝-气浮方法出水水质可达到《污水综合排放标准》(GB 8978-1996)中要求的二级排放标准,而且具有较高的抗冲击负荷能力。试验中还确定了三氯化铁的最佳投量、最佳pH值、最佳水力条件等主要影响因素的参数指标,可以为实际工程提供技术参数。无机混凝剂与有机高分子混凝剂复合应用的试验研究结果表明,阳离子型聚丙烯酰胺对无机混凝剂三氯化铁具有较好的助凝效果。尤其是采用混凝-气浮法,投加少量的阳离子型聚丙烯酰胺即可有效降低混凝三氯化铁投量,而且可使出水水质达到《污水综合排放标准》(GB 8978-1996)中要求的一级排放标准。技术和经济分析认为,采用混凝-气浮方法处理VAE乳液废水,投加复合高效混凝剂,具有投药量少,处理成本低,抗冲击负荷能力强,处理效果稳定高效等特点,经济效益好。更多还原

【Abstract】 Vinyl Acetate-Ethylene Copolymer Emulsion(VAE) is an important chemical product, There will be a large number of VAE emulsion wastewater during the production processes. The VAE emulsion wastewater is difficult to be treated, with the characteristics of high COD, high turbidity, poor biodegradability and high stability.Serious water pollution will be caused if the VAE emulsion wastewaters are discharged directly into water body.Coagulation-sedimentation and coagulation-air flotation processes are used to treat the VAE emulsion wastewater and effects of the process are studied in the study.The efficiencies and influence factors of the VAE emulsion wastewater treatment processes are investigated by composited dosing with inorganic coagulants and organic high molecular flocculants.Experiment results indicate that coagulation-sedimentation and coagulation-air flotation processes are both effective, with the coagulation-air flotation more effective . Under the best experimental condition, the effluent quality of the coagulation-air flotation process can be satisfied with the Class-Two Discharge Standard,specified in the integrated Wastewater Discharge Standard (GB8978-96). In addition, the process is provided with stronger ability of shock resistance load. The optimum conditions of ferric choride dosage, pH value, hydrodynamic condition and other factors are confirmed by experiments.The results can be acted as technical references for engineering applications.The experiment results with composited applications of inorganic coagulant and organic high molecular flocculant indicate that cationic polyacrylamide (PAM) is provided with better coagulation aid action to ferric chloride. The ferric chloride dosage is decreased by a litter addition of cationic PAM for the coagulation-air flotation process. The effluent quality can be satisfied with the Class-Two Discharge Standard, specified in the integrated Wastewater Discharge Standard (GB8978-96).Technical and economical analyses are considered that the VAE emulsion wastewater is treated feasibly by the cogagulation-air flotation process with inorganic coagulant and organic high molecular flocculant. The process has the characteristics of low coagulant dosage, low treatment cost, strong ability of shock resistance load, high and stable treatment efficiency, and better economic benefits.更多还原